<?php

if (!defined('BASEPATH'))
    exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package        CodeIgniter
 * @author        ExpressionEngine Dev Team
 * @copyright    Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license        http://codeigniter.com/user_guide/license.html
 * @link        http://codeigniter.com
 * @since        Version 1.0
 * @filesource
 */
// ------------------------------------------------------------------------

/**
 * Zip Compression Class
 *
 * This class is based on a library I found at Zend:
 * http://www.zend.com/codex.php?id=696&single=1
 *
 * The original library is a little rough around the edges so I
 * refactored it and added several additional methods -- Rick Ellis
 *
 * @package        CodeIgniter
 * @subpackage    Libraries
 * @category    Encryption
 * @author        ExpressionEngine Dev Team
 * @link        http://codeigniter.com/user_guide/libraries/zip.html
 */
class CI_Zip {

    var $zipdata = '';
    var $directory = '';
    var $entries = 0;
    var $file_num = 0;
    var $offset = 0;
    var $now;

    /**
     * Constructor
     */
    public function __construct() {
        log_message('debug', "Zip Compression Class Initialized");

        $this->now = time();
    }

    // --------------------------------------------------------------------

    /**
     * Add Directory
     *
     * Lets you add a virtual directory into which you can place files.
     *
     * @access    public
     * @param    mixed    the directory name. Can be string or array
     * @return    void
     */
    function add_dir($directory) {
        foreach ((array) $directory as $dir) {
            if (!preg_match("|.+/$|", $dir)) {
                $dir .= '/';
            }

            $dir_time = $this->_get_mod_time($dir);

            $this->_add_dir($dir, $dir_time['file_mtime'], $dir_time['file_mdate']);
        }
    }

    // --------------------------------------------------------------------

    /**
     *    Get file/directory modification time
     *
     *    If this is a newly created file/dir, we will set the time to 'now'
     *
     *    @param string    path to file
     *    @return array    filemtime/filemdate
     */
    function _get_mod_time($dir) {
        // filemtime() will return false, but it does raise an error.
        $date = (@filemtime($dir)) ? filemtime($dir) : getdate($this->now);

        $time['file_mtime'] = ($date['hours'] << 11) + ($date['minutes'] << 5) + $date['seconds'] / 2;
        $time['file_mdate'] = (($date['year'] - 1980) << 9) + ($date['mon'] << 5) + $date['mday'];

        return $time;
    }

    // --------------------------------------------------------------------

    /**
     * Add Directory
     *
     * @access    private
     * @param    string    the directory name
     * @return    void
     */
    function _add_dir($dir, $file_mtime, $file_mdate) {
        $dir = str_replace("\\", "/", $dir);

        $this->zipdata .=
            "\x50\x4b\x03\x04\x0a\x00\x00\x00\x00\x00"
            . pack('v', $file_mtime)
            . pack('v', $file_mdate)
            . pack('V', 0) // crc32
            . pack('V', 0) // compressed filesize
            . pack('V', 0) // uncompressed filesize
            . pack('v', strlen($dir)) // length of pathname
            . pack('v', 0) // extra field length
            . $dir
            // below is "data descriptor" segment
            . pack('V', 0) // crc32
            . pack('V', 0) // compressed filesize
            . pack('V', 0); // uncompressed filesize

        $this->directory .=
            "\x50\x4b\x01\x02\x00\x00\x0a\x00\x00\x00\x00\x00"
            . pack('v', $file_mtime)
            . pack('v', $file_mdate)
            . pack('V', 0) // crc32
            . pack('V', 0) // compressed filesize
            . pack('V', 0) // uncompressed filesize
            . pack('v', strlen($dir)) // length of pathname
            . pack('v', 0) // extra field length
            . pack('v', 0) // file comment length
            . pack('v', 0) // disk number start
            . pack('v', 0) // internal file attributes
            . pack('V', 16) // external file attributes - 'directory' bit set
            . pack('V', $this->offset) // relative offset of local header
            . $dir;

        $this->offset = strlen($this->zipdata);
        $this->entries++;
    }

    // --------------------------------------------------------------------

    /**
     * Add Data to Zip
     *
     * Lets you add files to the archive. If the path is included
     * in the filename it will be placed within a directory.  Make
     * sure you use add_dir() first to create the folder.
     *
     * @access    public
     * @param    mixed
     * @param    string
     * @return    void
     */
    function add_data($filepath, $data = NULL) {
        if (is_array($filepath)) {
            foreach ($filepath as $path => $data) {
                $file_data = $this->_get_mod_time($path);

                $this->_add_data($path, $data, $file_data['file_mtime'], $file_data['file_mdate']);
            }
        } else {
            $file_data = $this->_get_mod_time($filepath);

            $this->_add_data($filepath, $data, $file_data['file_mtime'], $file_data['file_mdate']);
        }
    }

    // --------------------------------------------------------------------

    /**
     * Add Data to Zip
     *
     * @access    private
     * @param    string    the file name/path
     * @param    string    the data to be encoded
     * @return    void
     */
    function _add_data($filepath, $data, $file_mtime, $file_mdate) {
        $filepath = str_replace("\\", "/", $filepath);

        $uncompressed_size = strlen($data);
        $crc32 = crc32($data);

        $gzdata = gzcompress($data);
        $gzdata = substr($gzdata, 2, -4);
        $compressed_size = strlen($gzdata);

        $this->zipdata .=
            "\x50\x4b\x03\x04\x14\x00\x00\x00\x08\x00"
            . pack('v', $file_mtime)
            . pack('v', $file_mdate)
            . pack('V', $crc32)
            . pack('V', $compressed_size)
            . pack('V', $uncompressed_size)
            . pack('v', strlen($filepath)) // length of filename
            . pack('v', 0) // extra field length
            . $filepath
            . $gzdata; // "file data" segment

        $this->directory .=
            "\x50\x4b\x01\x02\x00\x00\x14\x00\x00\x00\x08\x00"
            . pack('v', $file_mtime)
            . pack('v', $file_mdate)
            . pack('V', $crc32)
            . pack('V', $compressed_size)
            . pack('V', $uncompressed_size)
            . pack('v', strlen($filepath)) // length of filename
            . pack('v', 0) // extra field length
            . pack('v', 0) // file comment length
            . pack('v', 0) // disk number start
            . pack('v', 0) // internal file attributes
            . pack('V', 32) // external file attributes - 'archive' bit set
            . pack('V', $this->offset) // relative offset of local header
            . $filepath;

        $this->offset = strlen($this->zipdata);
        $this->entries++;
        $this->file_num++;
    }

    // --------------------------------------------------------------------

    /**
     * Read the contents of a file and add it to the zip
     *
     * @access    public
     * @return    bool
     */
    function read_file($path, $preserve_filepath = FALSE) {
        if (!file_exists($path)) {
            return FALSE;
        }

        if (FALSE !== ($data = file_get_contents($path))) {
            $name = str_replace("\\", "/", $path);

            if ($preserve_filepath === FALSE) {
                $name = preg_replace("|.*/(.+)|", "\\1", $name);
            }

            $this->add_data($name, $data);
            return TRUE;
        }
        return FALSE;
    }

    // ------------------------------------------------------------------------

    /**
     * Read a directory and add it to the zip.
     *
     * This function recursively reads a folder and everything it contains (including
     * sub-folders) and creates a zip based on it.  Whatever directory structure
     * is in the original file path will be recreated in the zip file.
     *
     * @access    public
     * @param    string    path to source
     * @return    bool
     */
    function read_dir($path, $preserve_filepath = TRUE, $root_path = NULL) {
        if (!$fp = @opendir($path)) {
            return FALSE;
        }

        // Set the original directory root for child dir's to use as relative
        if ($root_path === NULL) {
            $root_path = dirname($path) . '/';
        }

        while (FALSE !== ($file = readdir($fp))) {
            if (substr($file, 0, 1) == '.') {
                continue;
            }

            if (@is_dir($path . $file)) {
                $this->read_dir($path . $file . "/", $preserve_filepath, $root_path);
            } else {
                if (FALSE !== ($data = file_get_contents($path . $file))) {
                    $name = str_replace("\\", "/", $path);

                    if ($preserve_filepath === FALSE) {
                        $name = str_replace($root_path, '', $name);
                    }

                    $this->add_data($name . $file, $data);
                }
            }
        }

        return TRUE;
    }

    // --------------------------------------------------------------------

    /**
     * Get the Zip file
     *
     * @access    public
     * @return    binary string
     */
    function get_zip() {
        // Is there any data to return?
        if ($this->entries == 0) {
            return FALSE;
        }

        $zip_data = $this->zipdata;
        $zip_data .= $this->directory . "\x50\x4b\x05\x06\x00\x00\x00\x00";
        $zip_data .= pack('v', $this->entries); // total # of entries "on this disk"
        $zip_data .= pack('v', $this->entries); // total # of entries overall
        $zip_data .= pack('V', strlen($this->directory)); // size of central dir
        $zip_data .= pack('V', strlen($this->zipdata)); // offset to start of central dir
        $zip_data .= "\x00\x00"; // .zip file comment length

        return $zip_data;
    }

    // --------------------------------------------------------------------

    /**
     * Write File to the specified directory
     *
     * Lets you write a file
     *
     * @access    public
     * @param    string    the file name
     * @return    bool
     */
    function archive($filepath) {
        if (!($fp = @fopen($filepath, FOPEN_WRITE_CREATE_DESTRUCTIVE))) {
            return FALSE;
        }

        flock($fp, LOCK_EX);
        fwrite($fp, $this->get_zip());
        flock($fp, LOCK_UN);
        fclose($fp);

        return TRUE;
    }

    // --------------------------------------------------------------------

    /**
     * Download
     *
     * @access    public
     * @param    string    the file name
     * @param    string    the data to be encoded
     * @return    bool
     */
    function download($filename = 'backup.zip') {
        if (!preg_match("|.+?\.zip$|", $filename)) {
            $filename .= '.zip';
        }

        $CI = & get_instance();
        $CI->load->helper('download');

        $get_zip = $this->get_zip();

        $zip_content = & $get_zip;

        force_download($filename, $zip_content);
    }

    // --------------------------------------------------------------------

    /**
     * Initialize Data
     *
     * Lets you clear current zip data.  Useful if you need to create
     * multiple zips with different data.
     *
     * @access    public
     * @return    void
     */
    function clear_data() {
        $this->zipdata = '';
        $this->directory = '';
        $this->entries = 0;
        $this->file_num = 0;
        $this->offset = 0;
    }

}

/* End of file Zip.php */
/* Location: ./system/libraries/Zip.php */